g_lock: Make g_lock_dump return a complete list of locks

g_lock: Make g_lock_dump return a complete list of locks

To be honest, it did not really make sense to just pass in
lock holders individually. You could argue that it made sense
with in reality only G_LOCK_WRITE around, but soon we will have
G_LOCK_READ and thus multiple lock holders on a single lock.

Now that we also have userdata, change the g_lock_dump API

Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>